Sigma C 28-70 mm f/2.8 DG DN review

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Sigma C 28-70 mm f/2.8 DG DN

24 March 2025

Maciej Latałło

11. Summary

Pros:

solid but compact barrel,
very good image quality in the frame centre across the whole focal range,
good image quality on the edge of the APS-C/DX sensor,
slight longitudinal chromatic aberration,
very low lateral chromatic aberration,
low astigmatism,
slight vignetting on the APS-C sensor,
sensible performance against bright light,
silent, quick, and accurate autofocus,
slight focus breathing,
sensible out-of-focus areas.

Cons:

very high vignetting on full frame,
distinct distortion on both ends of the focal range.

One look at the lists of pros and cons and you know Sigma gives us exactly what they have promised. For a sensible price of $700 you can get a fast, compact, very solidly build zoom instrument that is able to provide a very good image quality across the focal spectrum. All the flaws we list here were only to be expected – Sigma doesn't conceal the fact that, when it comes to the Contemporary series, they give up on distortion and vignetting correction. In return there is more room when it comes to controlling other aberrations and physical dimensions and weight remain very moderate.

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Of course we have to compare the tested Sigma to the rival Tamron 28-75 mm f/2.8 Di III VXD G2. The price of the Tamron is a $100 higher as the price of the Sigma and it can offer you a bit better image quality, perhaps apart from chromatic aberration, a category where the Sigma prevails. Of course the Tamron is also heavier, bigger, and it makes an impression of an instrument that is not so solid and not so well weather-sealed. As you see every of these two lenses offers you something unique important, their competition is very intense. Of course from the perspective of customers it is a very good situation and we should be very pleased – let me finish this test with such an optimistic remark.